Perhaps you should try some spelling variations:
"modified parameter optimisation algorithm" » "modified parameter optimization algorithms", "modified parameter estimation algorithm", "modified parameter optimization algorithm"
"modified staffing estimation algorithms" » "modified staffing estimation algorithm", "modified staffing optimization algorithms", "modified staffing approximation algorithms", "modified caging estimation algorithms"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("modified staffing estimation algorithms") OR ("modified parameter optimisation algorithm"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified staffing estimation algorithms\") OR (\"modified parameter optimisation algorithm\"))".
• Removing quotes may allow a broader search: (( modified staffing estimation algorithms ) OR ( modified parameter optimisation algorithm )).
• Adding a wildcard symbol may retrieve word variants: (("modified staffing estimation algorithms") OR ("modified parameter optimisation algorithm"))*.